You are correct that AEDC once had a "moon tree," but it died several years
ago. The plaque commemorating the tree is still in place inside the memorial
park in front of the center's administration building.
NASA presented several installations with the seeds you referenced as a
"thank you" for their respective support in the lunar missions.
Thank you for your query.
DAVID M. HIEBERT
AEDC Historian
[Note - AEDC is the Arnold Engineering Development Center, the
flight simulation center at Arnold Air Force Base]